caliber
cal.i.ber or cal.i.bre \'kal-*-b*r\ n [MF calibre, fr. OIt calibro, fr. Ar qa-lib shoemaker's la]st 1a: the diameter of a bullet or other projectile 1b: the diameter of a bore (as of a cannon or other firearm) 2: the diameter of a round body; esp : the internal diameter of a h ollow cylinder 3a: degree of mental capacity or moral quality 3b: degree of excellence or importance : QUALITY